Determinants of Full Vaccination Coverage among Children Aged 12-23 Months in Bangladesh: A Comparison between High- and Low-Performing Divisions.

Introduction: A better understanding of the significant factors behind childhood vaccination is important for designing strategies to increase vaccination coverage and reduce child mortality and morbidity. The study is aimed at identifying the determinants of full vaccination coverage among children aged 12-23 months in Bangladesh and at comparing the determinants between high- and low-performing areas.

Methods: This study used the latest available Bangladesh Demographic and Health Survey 2017-18 data.

Outstanding conversion efficiency of 38.39% from a Perovskite/CIGS tandem PV cell: A synergic optimization through computational modeling.

An all-inorganic lead-free tandem PV cell consisting of two sub-cells CsSnGeI (perovskite) based top cell/CIGS-based bottom cell has been designed, simulated, and optimized by varying the thickness of pertinent layers utilizing the SCAPS-1D simulator. In the top sub-cell, a wide bandgap lead-free inorganic CsSnGeI perovskite is inserted as the primary absorber layer because of its distinctive characteristics with an ETL of ZnO, which is recognized for its high electron mobility & absorption coefficient, and an HTL of NiO to offer increased hole mobility with good chemical-durability. For the bottom sub-cell, we have selected p-type CIGS as the absorber with Spiro-OMeTAD as the apposite HTL to provide suitable offsets of valence and conduction band distribution and TiO as ETL to offer low-cost, low-ecotoxicity, excellent optical properties, and chemical-stability and thus offers improved efficiency of the overall tandem structure.